11. What system in boiler is to respond rapidly throughout the range of operation without a
fireman’s attention is of prime importance for a marine boiler.
(A) Blower
(B) Fuel-burning
(C) Water feeding
(D) Rolling
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統計: A(177), B(534), C(226), D(29), E(0) #3147376
統計: A(177), B(534), C(226), D(29), E(0) #3147376